Sewing machine



Immh 2,1926.

A. B. FOWLER SEWING MACHINE v Original Filed May 21. 1919 2 Sheets-Sheet1 wk. mwN

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March 2 1926.

A. B. FowLl-:R

SEWING MACHINE 2 Sheets-Sheet 2` Original Filed May 21, 1919 PatentedMar. 2, 1926.

ALFRED B. FOWLER, OF BEVERLY, MASS PATENT OFFICE.

ACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON,NEW JERSEY, A CORPORATION OF NEW JERSEY.

SEWING MACHINE.

Original application filed May 21, 1919, Serial No. 288,589. Divided andthis application filed September 25, 1920, Serial N0. 412,653.

T0 all whom t 'may concern.'

Be it known that I, ALFRED B. Fownnu, a citizen of the United States,residing at Beverly, in the county of Essex and State of Massachusetts,have invented certain new and useful Improvements in Sewing Machines;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

The present invention relates to sewing machines and more particularlyto mechanisms for actuating the back gage of an inseam shoe sewingmachine.

The principal object of the invention is to provide a back gageactuating mechanism for inseam shoe sewing machines of novel andimproved construction and mode of operation. To this end, the featuresof the invention consist in certain constructions, arrangements andycombinations of parts hereinafter described and claimed, the advantagesof which will be obvious to those skilled in the art.

The several features of the invention will be clearly understood fromthe following description and acco-mpanying drawings in which Fig. 1 isa sectional elevation looking from the right and taken on a pla-ne justto the right of the needle segment of an inseam shoe sewing machineembodying the features in their preferred form, and Fig 2 is a detailsectional elevation of the back gage and back rest locking mechanism.

The inse-am shoe sewing machine illustrated in the drawings may be andpreferably is the same as the machinev` illustrated and described inapplicants co-pending application Serial No. 298,589, filed May 21,1919, of which the present applicati-on constitutes a division. Thismachine, as illustrated, is provided with a curved; hook needle 2, aneedle guide 4, a thread finger 6, a looper 8, a back gage 10, a backrest or bunter 12, and a vertical rod 14 which at a predetermined pointin the final cycle of operations of the machine is moved upwardly, andwhich upon throwing the machine into operation is depressed.

The needle is secured in the usual manner to a needle segment 16 whichis pivotal- Renewed August 27, 1925.

ly mounted on a shaft 18 and is actuated by a link 2O having one endpivotally connected at 22 with the needle segment auf its other endpivotally connected with a cam actuated lever 24.

The back rest or bunter 12 comprises a roll mounted on a forwardlyspring pressed slide 26. The back gage 10 is connected as hereinafterdescribed to a locking slide 28. The slides 26 and 28 are provided withmeans for locking them together, which means may be and preferably isthe same as disclosed in applicants co-pending application, Serial No.254,104, filed September 14, 1918. The back gage is formed on theforward end of a carrier 80 which is connected by a link 82 with theback gage locking slide 28, one end of the link being pivoted upon astud 84 secured to the carrier 30 and' its other end being pivoted von astud secured to the slide 28. The back gage carrier is guided by meansof a bolt or pin 36 secured to the frame of the machine which extendsthrough a horizontal slot in the carrier. The free end of an arm 38 ispivotally connected with the stud 34 which arm is secured to a rockshaft 40. An arm 42 is pivoted upon the shaft 40 and is connected withthe arm 38 by a torsion spring 44 which is normally under no tension.During the work piercing movement of the needle 2, the back gage isfirst caused to lightly engage the work and is then pressed against thework under increasing pressure by means of a stud 46 on the needleactuating link 2O that. engages the arm 42 and through the torsionspring 44 and arm 88 thus actuates the back gage. The back gage and backrest are locked in engagement with the work at the limit of this strokeof the needle and until the needle returns to the limit of its loopdrawing stroke. In order that the back gage may not interfere with thefeeding of the work, means is provided for retracting the back gageafter the needle has reached the limit of its loop drawing movement. Tothis end, the rock shaft 40 carries an arm 47, the free end of which isengaged by a lug 48 projecting from a sleeve 50 that is mounted to slideon the vertical red 14. A spring 52 is coiled about the.

rod 14 and is interposed between the lower end of the sleeve 50 and acollar 54 secured to the rod. Wlhen the back gage is unlocked at thelimit et the loop drawing stroke of the needle, the coiled spring 52acts through the connecting mechanism to retract the back gage.` As thetorsion spring 44 is under no tension at this time it will not interferewith this action ot the coiled spring` and, also, as the strength ot thecoiled spring is considerably less than that ot' the torsion spring 44,the coiled spring will not interfere with the action of the torsionspring in advancing the back gage during the work piercing stroke of theneedle.

The upward movement the rod 14 upon stopping the machine increases thetension of the coiled spring 52, which ensures the complete retractionof the back gage at this time.

To lock the slides 2G and 2S against backward movement .a locking bar 56is provided having a rectangular' opening at its upper Iend throughwhich the slides pass. The upper and lower surfaces ot the opening inthe bar 56 are bevelled slightly at their edges as indicated in F 2, andthe bar is arranged at right angles to the slides in such a posit-ionthat a tilting movement of the bar will torce the two slides togetherand lock them against backward movement with relation to the lockingbar. The upper end ot the locking bar is received in a recess in a slide5T rigidly secured to the machine trame. The lower end ot the lockingbar 56 is engaged by a spring pressed plunger 58 which forces the bar ina direction to hold a cam roll G0 atthe lower end ot' the bar in contactwith a cam (S2 on the cam shaft ot the machine. The plunger 58 at itsend remote from the locking bar is mounted to slide in the hub ot' ascrew 64 mounted in the machine frame and at the end which contacts withthe locking bar is provided with a head between which and the hub ot'the screw 64 its actuating spring 66 is located. The arrangement of thelocking bar 56, the spring pressed plunger 5S vand the cam G2 is suchthat movement of the lower end of the bar by the cam against the actionot the spring pressed plunger unlocks the slides 26 and 2S, while amovement of the lower end or' the locking bar under the influence ot'the spring pressed plunger loc-ks the slides.

The slide 26 is pressed toward the shoe by a spring pressed arm G8`iournaled at its lower end in the irame of the machine and having itsupper end in engagement with the rear -end oit' the slide.

llhile it is preferred to employ the specilic construction andarrangement ot parts illustrated and described, it is to be understoodthat this construction and arrangen'ient is not essential except so faras specilied in the claims, and may be changed or modilied withoutdeparting from the broader features ot' the invention.

The nature and scope ot the present invention having been indicated, anda machine embodying the several i'features of the invention in theirpreferred torni having been specifically described, what is claimed isl. An inseam shoe sewing machine having, in combination, stitch formingdevices including curved hook needle, a back gage movable towards andtrom the work, means tor locking the back gage against the work and forunlocking the back gage, a spring acting on said gage, means forincreasing the tension ot the spring to press the back gage against thework and tor descreasing the tension ot the sprinf` after the gage islocked in position, and mans for retracting the back 2. An inseam shoesewing machine having, in combination, stitch forming devices includinga curved hook needle, a back gage movable towards and trom the work,means for locking the back gage against the work and for unlocking theback gage, a spring acting on said gage, means tor increasing thetension oi the spring to press the back gage against the work and fordecreasing the tension of the spring at'ter the gage is locked inposition, and a retracting spring tensioned by the movement ot' the backgage against the work for retracting the back gage.

3. An inseam shoe sewing machine Ihaving, in combination, stitch formingdevices including a curved hook needle, a back gage movable towards andfrom the work, means tor locking the back gage against the work and forunlocking the back gage, a spring acting on said gage, means t'orincreasing the tension of the spring to press the back gage against thework and for decreasing the tensionotl the spring after the gage islocked in position, a retracting spring Jfor retracting the back gage,and means acting on stopping the machine to increase the tension of saidretracting sprino.

ALFRED BFownnn

